The correct order of the process that occurs when a sperm encounters an egg is the Osperm reaches ovum, implantation occurs, zygote is formed, embryo begins secreting hCG. sperm reaches ovum, zygote is formed, implantation occurs, embryo begins secreting hCG. sperm reaches ovum, embryo begins secreting hCG, implantation occurs, zygote is formed. sperm reaches ovum, embryo begins secreting hCG, zygote is formed, implantation occurs. O

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